If the primary of a transformer were connected to a dc power source, the transformer would have a voltage output
A) at a higher efficiency than with an ac source.
B) that is also dc.
C) only while being connected or disconnected.
D) the same.
E) none of these

Question

Quizplus · Accepted Answer

Transformers require a changing magnetic field to induce a voltage in the secondary coil. DC power provides a constant magnetic field, so a transformer would only induce a voltage during the transient moments of connecting or disconnecting the DC source, when the magnetic field is changing.

If the Primary of a Transformer Were Connected to a Dc